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media/com_templates/js/admin-template-toggle-assignment.js

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+/**
+ * @copyright  (C) 2019 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license    GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+Joomla = window.Joomla || {};
+(Joomla => {
+  Joomla.toggleAll = () => {
+    const checkBoxes = [].slice.call(document.querySelectorAll('.chk-menulink'));
+    checkBoxes.forEach(checkBox => {
+      checkBox.checked = !checkBox.checked;
+    });
+  };
+  Joomla.toggleMenutype = a => {
+    const checkBox = [].slice.call(document.getElementsByClassName(`menutype-${a}`));
+    checkBox.forEach(element => {
+      element.checked = !element.checked;
+    });
+  };
+})(Joomla);